LG LM-X120HM Service Manual page 30

3. TROUBLE SHOOTING
3.5 GSM, WCDMA, LTE PART
3.5.2WCDMA RF Part
WCDMA RF Part support WCDMA B1/2/4/5/8 with FEM, PAM, PA, Transceiver component
Checking Flow
START
Check OTA performance
Check RF Conductive
Check ASM
Check PA&RF path
Check MT6177M
Check other signal path
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Only training and service purposes